BoonDocker POLARIS: 700/800 IQ Dragon Plug & Play User Manual
Page 11
BoonDocker – 1585 Hollipark Dr. Idaho Falls, ID 83401 – 208-542-4411 / 877-522-7805
www.boondockers.com – email:
– fax: 208-524-7381
Revised 1-16-08
Page 11 of 13
Be aware that too rich a mixture can cause the gauge to read lean due to unburned fuel not being read by the gauge (the
oxygen will produce a lean reading). Whenever the engine is decelerating, your A/F numbers will be lean - these
readings can be ignored. However, whenever the throttle is being applied, pay attention to the readings!
Higher numbers are leaner (less fuel), lower numbers are richer (more fuel). A 14.7:1 ratio means all the available
oxygen has combined with all the available fuel. Numbers from 11:1 to 13:1 generally produce the best power (extra
fuel helps cooling and can help prevent detonation). A lower A/F ratio (10.8 to 11.2:1) is considered safer on a turbo
since the extra fuel prevents heat build-up and helps prevent detonation. We recommend you find the lowest ratio where
the sled still runs without being too rich.
EGTs:
Exhaust Gas Temperature gauges can also be an effective tuning tool and are recommended, but they are not a substitute
for reading spark plugs and piston wash and for a general feeling of how the engine runs. Use EGTs only as a backup to
verify what you see. They can be misleading under certain conditions and safe readings can vary greatly from engine to
engine depending on such things as probe placement, fuel, timing, pipe design, porting, etc. Typical EGT temps can be
between 1250 – 1325degF after a long pull.
Plug and Pipe Color:
Color will develop inside the pipe and on the plug after running a while which can be used to determine fuel mixture. A
tan/cardboard brown color is desired. Light-gray is too lean, and dark brown is rich.
Tuning tips:
Important: Find the settings where your motor runs rich before you decide to go lean!
1. Tune with the engine and pipe at operating temperature. The sled’s ECU will make adjustments as the engine
warms up – you might think the engine needs leaner settings then later realize you are too lean once the engine
warms up.
2. Use the Load/Save Map feature to quickly change and compare fuel settings when testing. This can also be useful
for riding under different conditions. For example, changing elevations or temperatures may require different
adjustments if the stock ECU does not compensate properly for your modifications. For drag racing, you might
want to run richer settings for longer distances than you would for short distances.
3. One method for finding out where a fuel adjustment setting is effective, greatly increase only that setting. Run the
engine to find out when it suddenly becomes too rich – this is where that setting is effective. Be careful – you can
easily flood the motor, especially with LO load or low rpm settings. If this happens, to restart the engine you may
have to pull several times with the throttle held wide open.
4. The Stats Capture feature can be used to determine RPM, and if the load setting is LO, MD, or HI. The nitrous
button can be configured to capture these stats (see nitrous configuration section). From the Main Menu, select
N2O, set Btn to CAP. Whenever the button is pressed, the Stats: Capture screen will be displayed. The current
stats will be captured when the button is released.
N2O Menu in “Capture” mode:
Fuel TPS RPM Btn
040 OFF OFF
Æ
CAP
5. The nitrous handlebar button can be used to add or subtract a preset amount of fuel for interactive tuning purposes
(see nitrous configuration section below). From the Main Menu, select N2O, set RPM and TPS to OFF, set Btn to
TUN and adjust the fuel number as desired for the test (see example menu screen below). When the nitrous button
is pressed, this amount of fuel will be added or subtracted immediately from the current settings for all rpms and all
loads.
N2O Menu in “TUNE” mode:
Fuel TPS RPM Btn
040 OFF OFF
Æ
TUN